KD Fasteners, Inc.’s line of Monel 500 lock nuts offers great strength and corrosion resistance while also resisting fastener loosening due to torque or vibration.

Monel 500 lock nuts offer three times the yield strength and two times the tensile strength of Monel 400 while maintaining the excellent corrosion resistance characteristic of its predecessor. These attributes are obtained by an age hardening process where aluminum and titanium are added to the nickel-copper base and then precipitated throughout the matrix.

Monel 500 hex nuts also have good toughness at high temperatures, low permeability and are non-magnetic at temperatures as low as -150°F. They remain corrosion resistant in environments ranging from pure water to non-oxidizing mineral acids, salts and alkalis. Finally, Monel 500 hex nuts offer excellent resistance to high-velocity sea water and resistance to a sour gas environment.

Monel 500 CharacteristicsMonel 500 locknut

  • Corrosion resistance
  • Good strength and hardness
  • Resistant to a sour gas environment
  • Spark resistant
  • Non-magnetic to -200°F
  • Excellent tensile and yield strengths at subzero temperatures

These characteristics make Monel 500 lock nuts ideal for a wide variety of marine applications.


  • Pump shafts
  • Impellers
  • Doctors blades and scrapers
  • Oil and gas production
  • Electronic components
  • Sour-gas service applications
  • Oil well tools and instruments
  • Marine industry
  • Cryogenic applications

Monel 500 lock nut styles

  • Grade C all-metal cone
  • Grade A reversible
  • Flexloc nut
  • Nylon insert

Monel 500 lock nuts are made in the United States. Whether you need a standard or custom size, KD Fasteners has a solution for you.  Contact us today by calling 1-800-736-5014 or filling out our contact form.